The first to rush into Unsan Castle was the 4th Company of the 20th Regiment of the 2001 Mountain Division, and when they reached the highway bridge, it was a platoon of the Samhan Yasukuni Army guarding the bridge. "A column of soldiers of a company approached the south bridge deck solemnly and neatly along the main road leading to Yongsan-dong. They were also wearing snow camouflage winter suits with no markings, and there were no markings on their steel helmets, so the Samhan puppet soldiers who were guarding the bridge probably thought they were the elite troops of our army and let them pass without questioning, because they came in a dignified and very quiet manner. The war history of the Japanese army is recounted. According to the military history of the Eighth Army, when the Wehrmacht soldiers crossed the bridge, "their company commanders exchanged military salutes with the officers of the Samhan Yasukuni Army on duty." After crossing the bridge, the column had been advancing north on the main road, and soon approached the battalion headquarters, when they suddenly signaled that they would attack the headquarters of the first division of the 5th Division of the Yasukuni Army. The military operations of the 4th Company were like a stage performance, and the wit of the Chinese soldiers was vividly displayed here.

The regimental headquarters of the first regiment of the Yasukuni Army immediately became chaotic, and the soldiers of the Wehrmacht spread out in a fan-faced formation, and around the regimental headquarters was a dense burst of "crackling" fire from "repeating crossbows" and semi-automatic rifles, and the "clicking" of "click" submachine guns, with occasional roar of grenade explosions. The puppet army was quickly defeated, the entire regimental headquarters was swept away, almost all the officers were killed at the first time, and the remaining soldiers fled except for those who disarmed and surrendered, and no one resisted the Wehrmacht.

The Japanese army in Yunshan City began to flee south with some puppet troops, but their back road had been cut off. An expatriate armed force composed of soldiers in the township came in a hurry, but when they reached the vicinity of the road between Yongseong-dong and Yongyongdong, south of Unsan, they were stubbornly resisted by the direct subordinate team of the 20th Mountain Division. The Wehrmacht used mortars and 107 rocket artillery to bombard this powerful Japanese armed force, and several Howling Eagle attack planes of the passing air force also joined in the fun, sprinkling white phosphorus incendiary shells like a downpour on the main road, and this Japanese and overseas Chinese armed force of 7 or 800 people, which had only light weapons, almost suffered casualties, but it was still of no help to the position of the directly subordinate team of less than 200 people.

After the loss of Yunshan, the retreat routes of the 73rd Wing and the 74th Wing were completely closed, while the 6th and 8th Jibu Divisions of the Eighth Group Army of the National Defense Army, which were rolling in from the north bank of the Yalu River, carried out attractive attacks on the 75th and 76th Wings deployed on the front line of Yanchuan and Guicheng, and used the superiority of artillery fire and air force to trap the 7,000 or 8,000 Japanese troops of these two wings in the defensive line, so that they would no longer have the slightest chance to get out of their predicaments.

At present, the two divisions of the Japanese army in the north have all been stuck or eaten by the Wehrmacht, and only the baggage troops of the 19th Division stationed in Pyongyang, the troops directly under it, and the 4th Wing of the 2nd Division in the direction of the reinforcement stadium are still active. In the end, in order to avoid becoming the first lieutenant general division commander to be captured alive by the enemy on the battlefield, Ozaki Yoshiharu had to consult Commander Daiwa Jiro in Seoul, and then take the members of the division headquarters south by train overnight, and rushed to the Shariwon in the early morning of the next day, which can be regarded as an escape.

The rapid reaction department of the Chinese National Defense Forces is accustomed to using a large number of smoke and fog bombs to cover at the beginning of the attack, and the machine guns and artillery fire at full speed to cover the infantry, and the infantry only needs to charge in the armored transport vehicle and do not shoot, so as to avoid wasting time, and the distance of 500 meters can be more than 40 seconds at most to rush through by machine gun and artillery fire in an instant, and directly enter the link of machine gun cleaning and infantry search. If the gun is fired halfway, not only can not be effectively aimed, but also slow down the impact speed, so China's rapid reaction force is often stepping on the artillery point impact, which is due to the fact that the Chinese National Defense Force has attached great importance to infantry and artillery coordination since the beginning of the establishment of the army, and all non-commissioned officers and more than half of the soldiers are junior high school education, can quickly learn to master the artillery guidance technology, with the car radio is countless artillery advance guides, there will be balloon observation groups and aircraft observation data in the sky to the artillery, to carry out concentrated and accurate rapid strikes, Without strong infantry and artillery coordination, the Wehrmacht's combat effectiveness would have been reduced by at least half.

The artillery firing technology of the Chinese National Defense Forces is quite accurate, for example, the 35MM machine guns mounted on wheeled vehicles have become the backbone heavy machine guns specially used to hit the Japanese army, and in the offensive and defensive battle of Dingzhou, the heavy machine gun squadron of the 76th Wing of the Japanese elite fought for less than half an hour, and the 36 heavy machine guns of the whole wing were reimbursed by the 35mm machine guns of the National Defense Forces, and no one in the Japanese army dared to enter the machine gun bunker again.

Similarly, in the Battle of Yunshan, the 8 mountain guns of the independent mountain artillery squadron of the 73rd Wing lined up to bombard the positions of the Wehrmacht, covering the breakthrough of the Japanese infantry, and less than two minutes later, the Wehrmacht used the artillery mirror and the hyperbolic intersection method to measure the Japanese artillery position, and the 105 howitzer shells of the counterattack followed up, directly ending the nest of the mountain artillery squadron.

And once the Wehrmacht succeeded, it quickly entered the pursuit, for example, in the pursuit of Changjin Lake, the 10th Mountain Division of the Wehrmacht advanced on foot like the Japanese army, but after first shelling the Japanese army, and then calling for aircraft to support the ground, after killing and injuring the Japanese army in large numbers, the pursuit force of the Wehrmacht quickly interspersed, blocking all the ways out of the Japanese army, and finally solved the last unit of the 16th Wing on the shore of Changjin Lake.

In fact, the combat effectiveness of the Japanese army in the defense is still very strong, as soon as they arrive at the place, they immediately start to repair fortifications, the position is clever, can contain the key points, give full play to the firepower, their own technology is excellent, and at the same time they have a high degree of dedication, they are good at fighting independently, even if they are a small team, a detachment is surrounded by superior opponents, they can fight calmly without lying or busy. They also used the night to carry out night raids and counterattacks, taking advantage of the sound of artillery on both sides or the darkness of the night, a team of 20-30 people took advantage of the opponent's unstable foothold to attack and seize the stronghold. Or a group of 3-10 people drilled into the gap to attack the opponent's organs and artillery positions, and lurked in the dense forest of the main road to ambush. However, in the face of the 10th Mountain Division, which also dared to fight, was agile, had superior firepower, and could also receive effective air support, the Japanese army was tormented by a lack of materials, so three days later, Hideo Yokoyama decided to lay down his arms. It was understandable to lead more than 1,400 Japanese officers and soldiers to surrender to the 10th Mountain Division. If they resist, they will not be wiped out for another 24 hours.

Compared with the standing divisions or garrison troops of the Japanese army, the combat actions of the Sanhan Yasukuni Army are obviously not good, lack of artillery support, often hundreds of people swarm to charge, and the Wehrmacht troops will retreat in embarrassment when they are cross-strafed by machine guns, and the puppet army often hides in the nearby woods and hills when it is busy, while the artillery of the Wehrmacht specializes in these places, and a puppet army of thousands of people can herd sheep in three or two strokes, so the achievements of the Sanhan puppet army in the later war history are often brushed aside, and it is not embarrassing enough to show off.

Pyongyang and Hamhung have fallen one after another, and the strategic support point of the Japanese army in the north of Samhan has completely collapsed. After the tense situation between China and Japan, Japan transferred the second and fourth divisions from the country to enhance the strength of the garrison army, originally thinking that the four divisions were enough to resist the first round of offensive of the Chinese defense forces and buy time for the subsequent increase in troops, but from the beginning of the war to the fall of Pyongyang on November 14, the Japanese military obviously overestimated the combat effectiveness of these divisions. After the Wehrmacht had devastated two divisions with only five divisions, a week after the dispatch of troops, the advance of the Chinese Wehrmacht had reached the front line of Nanpu and Huangzhou.

Here we have to talk about the Japanese garrison system in Samhan. The Samhan Garrison is the collective name for Japan's invading forces stationed in Samhan. In June 1894, the Japanese military department sent a mixed brigade led by Major General Yoshimasa Oshima to invade Samhan, and in July, it increased troops to Samhan and launched the Sino-Japanese First Sino-Japanese War. In August, the Japanese army that invaded Samhan was organized into the First Army of the Japanese Army, with Army General Yama Aritomo as commander and Major General Ogawa Matsuji as Chief of Staff, under the command of the Third and Fifth Divisions. After the signing of the Treaty of Shimonoseki, Japan gained control of Samhan. From then on, Japan began to station troops in Samhan and set up the Samhan Army Headquarters. After the end of the Russo-Japanese War in 1905, Japan dominated the three Koreas. The task of the Japanese army stationed in Samhan was to ensure the "independence" and "territorial integrity" of Samhan and to defend against attacks by enemies from the mainland side. Senior General Hasegawa Yoshimichi is the commander of the Samhan Army, manages all Japanese military and political affairs in Samhan, and is under the direct command of the Emperor and the General Staff Headquarters, and his status is much higher than that of the Japanese minister in Samhan. In 1910, Japan formally annexed Samhan and established the Samhan Governor's Office, with the commander of the Samhan Army as the governor-general and directly under the emperor's orders. At the same time, the main forces of the 19th and 20th Divisions of the Japanese Army were organized to form a new Japanese Army stationed in Samhan. In 1931, during the "918 Incident", Lieutenant General Hayashi Mijuro, commander of the Japanese Army stationed in Samhan, sent the 39th Mixed Brigade led by Major General Tatsujiro Kamura and two squadrons under the command of the 6th Flying Wing stationed in Pyongyang to the northeast to reinforce the Kwantung Army. In May 1936, the Japanese Army was unified, and the Japanese Army in Samhan became one of the three major dispatch groups. When the Pacific War broke out in 1941, the Japanese Army in Samhan was incorporated into the Japanese Defense Headquarters, under the command of General Otozo Yamada, the commander-in-chief of the defense. At the end of 1943, it was transferred to the direct command of the base camp, under the jurisdiction of 2 basic divisions. In the spring of 1945, in order to prepare for the decisive battle on the Japanese mainland, the Japanese Army stationed in Sanhan was reorganized into the 17th Front Army, under the command of the Kwantung Army, under the jurisdiction of the 34th and 58th armies, as well as the 120th, 150th, 160th, 320th divisions, and 127th mixed brigades, a total of 9 divisions and 3 brigades, Lieutenant General Yoshio Kamitsuki was the commander, Lieutenant General Junjiro Ihara was the chief of staff, and the headquarters was located in Seoul. On September 9, 1945, Lieutenant General Yoshio Kamitsuki, commander of the Japanese Army in Samhan, surrendered to Lieutenant General John 61 Reed and 61 Hodge, commander of the 24th Army of the U.S. Army, in Seoul. For the sake of the well-being of the Samhan people, the Chinese National Defense Forces decided to fulfill the protection obligations of the suzerain, annihilate the Samhan garrison and the puppet army, and restore the territory of Samhan.